What it is and where it fits
The Siemens 3VA2325-5HL32-0DH0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current with a flat derating curve — still 250 A all the way to 70 °C ambient, so no thermal headroom loss in a hot panel. Three-pole, line-protection design, fitted with an undervoltage release (UVR) and a 2-auxiliary + 1 trip-alarm switch block. The adjustable thermal-magnetic trip covers 375 A to 3000 A, letting you dial in the long-time and short-time pickup without swapping the breaker. Mounts into a standard panel footprint — 138 mm wide, 248 mm tall, 110 mm deep — with enough interrupting capacity to serve as a main or feeder breaker in a 480 V distribution board. SCCR at 415 V is 121 kA; at 500 V it's 75.6 kA; at 690 V it drops to 7.5 kA, so watch the voltage class if you're on a 690 V line.
Key ratings and what they mean for your BOM
The 250 A continuous rating holds at every ambient from 40 °C up to 70 °C — no derating required. That simplifies panel thermal calculations: you don't need to oversize the frame for a hot environment. The adjustable trip range (375 A minimum to 3000 A maximum) means the same breaker can cover a wide spread of load currents; set the long-time pickup via the dials on the front. Interrupting ratings span the common distribution voltages: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V. That's enough for high-fault installations like industrial substations or large motor control centers. The 7.5 kA at 690 V is the weak point — if your system is 690 V with high available fault current, this breaker may not coordinate; step up to a higher-rated frame. Max power loss is 40 W — relevant for enclosure heat rise calculations, especially in a sealed panel with multiple breakers. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C.